[pooriar]

Same as this?

  (1..20).each do |i|
    puts i if i.odd? || i.prime?
  end

edit - upon testing, I just realized the parent's code prints 10 & 16, my code does not, so not the same.

[codesnik]

flipflop basically has a hidden boolean variable for state. Btw, while I HAD used it, i still have no idea what's the scope of that state and when it'd reset itself.